Unit 4 Lesson 2 Test: Chemical Equations

Miles and Delilah were doing a science experiment where they burned a piece of paper. They noticed that the mass of the remaining ash was less than the mass of the original paper. Which statement best explains this phenomenon?

• The ash has less volume than the paper.

• Some of the matter is destroyed during the reaction.

• The mass of the ash cannot be accurately determined.

• Some of the products of the reaction were given off as a gas.

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

• A
• B
• C
• D

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

NGSS.MS-PS1-1

Anne and Miles are learning about coal burning in their science class. When coal is burned, sulfur is released into the air, where it reacts with oxygen to produce sulfur dioxide and sulfur trioxide. Which of these is true of this process?

• The identity of each reactant remains the same.

• Sulfur dioxide and sulfur trioxide are the reactants in this change.

• The products have different chemical properties than those of the reactants.

• The products contain more sulfur atoms and fewer oxygen atoms than the reactants.

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

Avery and Ryan are working on a science project about rusting. They need to complete the balanced chemical equation showing the process of rusting. Which number should they use?

• 1

• 2

• 4

• 12

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

Ryan and Anne are working on a science project. They need to write down the combination of chemical symbols and numbers that represents a single unit of water. This combination is known as a_________________________.

• chemical formula

• chemical equation

• product

• reactant

In a science class, Blake and Avery are working together to write chemical formulas. Their teacher explains that a ______________, a number below and to the right of the symbol, shows how many atoms of that element there are.

• subscript

• superscipt

• exponent

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NGSS.MS-PS1-1

Anne and Landon are studying a mineral sample of hematite, which has the chemical formula Fe₂O₃. Identify the correct number of atoms present.

• 3 Iron Atoms and 2 Oxygen Atoms

• 2 Iron Atoms and 3 Oxygen Atoms

• 3 Iron Atoms and 3 Oxygen Atoms

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NGSS.MS-PS1-1

Avery and Miles are studying minerals in their science class. They come across a sample of halite. How many atoms are present in the mineral halite?

• 1 sodium atom and 1 chlorine atom

• 0 sodium atom and 0 chlorine atom

Tags

NGSS.MS-PS1-1

Avery and Blake are studying minerals in their science class. They come across a mineral called pyrite, which has the chemical formula FeS₂. Select the correct amount of atoms in the mineral below.

• 0 iron atoms and 1 sulfur atom

• 0 iron atoms and 2 sulfur atom

• 1 iron atom and 2 sulfur atom

Tags

NGSS.MS-PS1-1

Ryan and Anne are studying minerals in their geology class. They come across a mineral with the formula Ca3Al2(SiO4)3. How many OXYGEN Atoms are present in this mineral?

• 4

• 7

• 12

• 14

Tags

NGSS.MS-PS1-1